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| United States Patent |
5,344,608
|
|
Eom
, et al.
|
September 6, 1994
|
Alloyed metal for horseshoes of race horse
Abstract
The present invention relates to an alloy metal horseshoe for a race horse.
The objective of the invention is to provide an alloy metal horseshoe for
a race horse, which is light in weight, of great expansibility and
hardness, with high abrasion resistance, shock absorption and ductility,
capable of being slightly modified to suit the form of the horsehoof at
the time of fitting, and that can rationalize the manufacturing process
with heat treatment omitted. The horseshoe used a metal alloy made by
mixing and dissolving Si:0.05-0.10%, Fe:0.05-0.10%(WT), Cu:0.10-0.20%(WT),
Mn:0.10-0.20%(WT), Mg:3.00-5.00%(WT), Cr:0.05-0.15%, Zn:0.05-0.10%, and
Al:96.6-94.15%(WT) in an electric furnace.
| Inventors:
|
Eom; Young ho (Seoul, KR);
Nam; Tae un (Seoul, KR)
|
| Assignee:
|
Korea Racing Association (Kwachun-City, KR)
|
| Appl. No.:
|
081060 |
| Filed:
|
June 25, 1993 |
| Current U.S. Class: |
420/532; 148/439; 168/4; 420/534; 420/541; 420/546 |
| Intern'l Class: |
C22C 021/06; A01L 001/00 |
| Field of Search: |
420/532,534,541,546
148/439
168/4
|
References Cited
U.S. Patent Documents
| 4017337 | Apr., 1977 | Winter et al. | 420/534.
|
| 4645543 | Feb., 1987 | Watanabe et al. | 148/439.
|
| 4655293 | Apr., 1987 | Criner, et al. | 168/4.
|
Primary Examiner: Andrews; Melvyn J.
Assistant Examiner: Koehler; Robert R.
Attorney, Agent or Firm: Nikaido, Marmelstein, Murray & Oram
Claims
What is claimed:
1. A horseshoe comprising an alloy manufactured by dissolving and mixing
Si:0.05-0.10%(WT), Fe:0.05-0.10%(WT), Cu:0.10-0.20%(WT),
Mn:0.10-0.20%(WT), Mg:3.00-5.00%, Cr:0.05-0.15%(WT), Zn:0.05-0.10%(WT),
and Al:96.6-94.15%(WT) in an electric furnace, wherein said horseshoe does
not require solution treatment and annealing heat treatment.
Description
DETAILED DESCRIPTION OF INVENTION
The present invention relates to an alloyed metal designed to be used for
horseshoes of a race horse. The objective of this invention is to provide
a light alloyed metal excellent in abrasion resistance, shock absorption,
and in ductility, for the horseshoes of race horses.
The horseshoe should primarily be light with ductility so that its shape
may be changed a little to correctly fit on the horsehoof. It should also
have the anti-abrasiveness to long endure frictions with the surface of
the track and to reduce the shock that occurs at the time of stepping on
the track surface.
Since the conventional horseshoe was heavy as having been made mainly of
mild steel, and poor in shock absorption because of its insufficient
ductility, the shoe has recently been made of alloyed alumnium buried with
elastic shock-absorbing materials such as rubber and plastics but found
difficult to protect the hoof and kneejoint of the horse because of
defects from its complex and easily breakable structure.
Since the race horse runs at a speed of 60 Km/Hr during the race undergoing
a shock of 1 ton in a moment (0.017 second) the horseshoe must be
excellent in abrasion resistance and shock absorption and ductile enough
to change its shape a little so as to suit the diverse sizes and forms of
the hooves at the Lime of fitting on the hoof.
To improve and solve the said problems of the conventional mild steel or
almunium horseshoe, the present invention developed an alloyed metal to be
used as a horseshoe of the race horse. This alloyed metal is only about
one-third of the weight; of the mild steel horseshoe and excellent in
abrasion resistance, shock absorption and ductility. To rationalize the
manufacturing process of the invention, 5XXXAl of Al-Mg series of non-heat
treatment was adopted, which did not require precipitation hardening with
soluting and aging treatments. A detailed description of the invention
follows.
The present invention is an alloyed metal for use as horseshoes of the race
horse, that was made by mixing Si:0.5%-0.10%(WT), Fe:0.05-0.10(WT),
Cu:0.10-0.20%(WT), Mn:0.10-0.20%(WT), Mg:3.00-5.00%(WT), Cr:0.05-0.15(WT),
Zn:0.05-0.10%(WT), and Al:96.6-94.15%(WT).
The effects of action of the present invention are described below.
The horseshoe of the race horse should primarily be capable of resisting
frictions with the track surface, absorbing the momentary shock of one ton
occurring from the speed of 60 Km/Hr during a race, and resisting abrasion
therefrom. In view of this, the inventor, therefore, inventor adopted the
alloyed metal as light as one-third of the conventional mild steel shoe,
to protect the hooves and knee joints of the race horse and to enhance the
racing speed and to enable the shoe securely and perfectly fit on the hoof
by taking advantage of its ductility to modify its shape a little.
Meanwhile, to rationalize the manufacturing process of the horseshoe, the
5XXXAl of Al-Mg alloy series (American Alloy series) was adopted which
does not required precipitation hardening under solut-and aging
treatments. The biggest demerit of this 5XXX series is excessive Mg which
causes too much stress corrosion cracking due to recrystallized annealing,
and, thereby, the internal stress is removed to cause an excessive
ductility and contraction, which again results in a low hardness and
strength. In order to hold the extreme abrasion resulted therefrom in
check, an appropriately safe strength has been given by adjusting the
content of Mg to be 3.00-5.00%(WT) and adding 0.01-0.10%(WT) of Zn thereto
so that the shape of the shoe may be modified a little at the time of
filling. Furthermore, to increase anti-corrosive effects of impure
materials, Fe is minimized to be 0.03-0.08%(WT) and Cu and Mn were reduced
respectively to be 0.10-0.20%(WT).
Further, shown in the table be low are the figures of chemical components
and comparative values of expansibility and ductility of the present
invention which is of non-precipitation hardening type, Al-Cu alloy and
Al-Zn series alloy which are of precipitation hardening type, and Al-Mg
which is another of non-precipitation hardening type.
__________________________________________________________________________
Comparative Table of Expansibility and Ductility
of the Present Invention and Each Alloy Series
Component Expansibility &
Ductility
Sample Si Fe Cu Mn Mg Cr Zn Al Strength (Kg/mm.sup.2)
(%)
__________________________________________________________________________
1 The Invention
0.08
0.08
0.11
0.13
5.00
0.12
0.05
94.89
30 42.5
2 Al--Cu Series
0.67
0.14
3.9
0.79
0.43
0.01
0.48
93.58
39 17
3 Al--Cu Series
0.05
0.13
4.00
0.50
1.30
-- 0.05
93.89
44 14
4 Al--Zn Series
0.06
0.12
1.46
0.2
3.14
0.32
6.02
88.86
56 10
5 Al--Mg--Zn Series
0.04
0.13
0.03 2.18
0.28
0.06
97.28
54 13
6 Al--Mg Series
0.03
0.09
1.19 2.48
0.26
1.93
94.02
18 36
7 Al--Mg Series
0.06
0.23
0.01 1.45
0.17
0.01
98.09
15 33
__________________________________________________________________________
As shown in this table, it can be known that the present invention is
inferior in expansibility and strength to the Al-Cu series and Al-Zn
series but far superior to the other Al-Mg series while it has been proved
that its ductility is much greater than the other alloy series with
excellent abrasion resistance so that it gives room for modifying its
shape as to suit the form of the hoof during fitting. Al-Cu series of 2
and 3, Al-Zn series of 4 and Al-Mg-Zn series were kept for 20 minutes at
480.degree.C. and for 30 minutes at 500.degree. C. Then, they were placed
one hour for soluting treatment at 500.degree. C. and underwent aging
treatment for 20 hours at 160.degree.. The other Al-Mg series of 6 and 7,
after going through soluting treatment for two hours at 350.degree. C.,
underwent annealing heat treatment. However, the sample of this invention
of Al-Mg series of 1 immediately underwent the annealing heat treatment
without going through soluting treatment.
The horseshoe thus manufactured for the race horse with the said structure
of alloyed metal is capable of reducing the area of contact with the track
surface by the sloped height of its internal and external sides,
minimizing the shock of contacting the track surface by evenly
distributing the force, and, thereby increasing the durability of the
horseshoe.
As stated above, this alloyed metal of non precipitation hardening Al-Mg
series, to be used as the horseshoe of the racehorse, is greater in
ductility and lighter in weight than the existing mild steel, Al-Zn series
alloy or Al-Cu and Al-Mg of precipitation hardening type. It is also
excellent in abrasion resistance and shock absorption with abundant
ductility. Therefore, the shoe is easily filled on the hoof and a very
useful invention that can rationalize the manufacturing process.
EXAMPLE OF APPLICATION
The desired alloyed metal to be used for the horseshoe of the race horse is
obtained by dissolving and mixing the pure almunium 96.39 (WT) made by
ordinary method under Bayer process with Si:0.08%(WT), Fe:0.08%(WT),
Cu:0.15%(WT), Mn:0.13%(WT), Mg:3.00%(WT), Cr:0.12%(WT) and Zn:0.05%(WT) in
an electric furnace.
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